Heat exchange – Intermediate fluent heat exchange material receiving and... – Liquid fluent heat exchange material
Reexamination Certificate
1999-12-27
2001-06-26
Atkinson, Christopher (Department: 3743)
Heat exchange
Intermediate fluent heat exchange material receiving and...
Liquid fluent heat exchange material
C165S110000, C165S917000, C123S041540
Reexamination Certificate
active
06250377
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to engine radiators, and particularly to a radiator having an integral top tank overlying the radiator coolant exit passage, whereby a barrier is provided against downflow of air into said exit passage. The invention prevents, or minimizes undesired air flow into the coolant pump, which may result in cavitation failures.
Some engine radiators of the downflow type have plural finned heat exchanged tubes (or passages.) extending between an upper tank and a lower tank. The lower tank has a coolant exit passage extending downwardly from the tank bottom wall for conveying coolant to a coolant pump mounted on the engine.
It has been found that during the engine operation air in the upper tank of the radiator can be pulled downwardly through those heat exchange tubes that are in direct vertical alignment with the coolant exit passage. Coolant pump suction draws this air from the radiator coolant exit passage through the lower radiator hose into the pump and forces it through the engine. Such airflow is disadvantageous in that it can degrade the cooling system and result in liner cavitation. Also, such air can form a vapor lock in the coolant circulation system so as to reduce coolant flow. In some cases small air bubbles can be formed in the coolant, thereby reducing the heat-absorption properties of the coolant; the coolant assumes a dark brown appearance having a reduced capability for extracting heat from the contacted engine surfaces.
The present invention contemplates the employment of a small hood in the lower tank of the radiator for blocking downward airflow into the coolant exit passage, especially during the engine start-up period. The hood is designed to overlie the coolant exit passages as to obstruct air from re-entering the cooling system via the fill line.
Specific features of the invention will be apparent from the attached drawings and description of an illustrative embodiment of the invention.
REFERENCES:
patent: 2235806 (1941-03-01), Walker et al.
patent: 3254707 (1966-06-01), Ferguson
patent: 3989103 (1976-11-01), Cieszto et al.
patent: 4491174 (1985-01-01), Villoval
patent: 4781247 (1988-11-01), Schulz
patent: 5044430 (1991-09-01), Avrea
patent: 0075750 (1983-01-01), None
patent: 1286713 (1962-01-01), None
patent: 1191609 (1985-01-01), None
Atkinson Christopher
Detroit Diesel Corporation
Panagos Bill C.
LandOfFree
Engine radiator having an air control hood does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Engine radiator having an air control hood, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine radiator having an air control hood will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2439106